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CLN: use standard method to set unhashable object #36717

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CLN: use standard method to set unhashable object #36717

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b951036
CLN: use standard method to set unhashable object
fangchenli Sep 28, 2020
3fa68ab
CLN: fix TypeError message
fangchenli Sep 28, 2020
456a9fa
CLN: add reference and ignore type check
fangchenli Sep 30, 2020
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7 changes: 2 additions & 5 deletions pandas/core/generic.py
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Expand Up @@ -1764,11 +1764,8 @@ def _drop_labels_or_levels(self, keys, axis: int = 0):
# ----------------------------------------------------------------------
# Iteration

def __hash__(self):
raise TypeError(
f"{repr(type(self).__name__)} objects are mutable, "
f"thus they cannot be hashed"
)
# to indicate this object is unhashable (https://lgtm.com/rules/1780095/)
__hash__ = None # type: ignore

def __iter__(self):
"""
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2 changes: 1 addition & 1 deletion pandas/tests/frame/test_api.py
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Expand Up @@ -123,7 +123,7 @@ def test_not_hashable(self):
empty_frame = DataFrame()

df = DataFrame([1])
msg = "'DataFrame' objects are mutable, thus they cannot be hashed"
msg = "unhashable type: 'DataFrame'"
with pytest.raises(TypeError, match=msg):
hash(df)
with pytest.raises(TypeError, match=msg):
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2 changes: 1 addition & 1 deletion pandas/tests/series/test_api.py
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Expand Up @@ -268,7 +268,7 @@ def test_index_tab_completion(self, index):
def test_not_hashable(self):
s_empty = Series(dtype=object)
s = Series([1])
msg = "'Series' objects are mutable, thus they cannot be hashed"
msg = "unhashable type: 'Series'"
with pytest.raises(TypeError, match=msg):
hash(s_empty)
with pytest.raises(TypeError, match=msg):
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